Why nearly-equal custody time doesn’t mean nearly-equal impact on a PDA child’s nervous system

TL;DR

• What’s happening: Pathological Demand Avoidance (PDA) is a profile within the autism spectrum where everyday demands can trigger a genuine fight, flight, or freeze response. Divorce, even a well-managed one, is a concentrated stretch of demands, and it can push an already-anxious nervous system into chronic survival mode.

• A pattern I see often: Many couples arrive at a low-demand, collaborative parenting approach together through years of trial and error, before they even separate. It’s after separation that a new partner, a grandparent, or well-meaning outside advice starts nudging one household back toward a more traditional structure, and the child’s regulation quietly starts to unravel.

• The custody-specific problem: Even in a genuinely equal 50/50 split, a child can look composed in one home and fall apart in the other, not because one parent it failing, but because the child only feels safe enough to let go of what they’ve been holding once they reach the place that doesn’t feel like a threat.

• What courts get wrong: Family law professionals are trained on neurotypical developmental models and often aren’t equipped to recognize what they’re actually looking at, so neuroaffirming accommodations can read as permissiveness.

• How I work: I help families translate what’s happening clinically into language that protects the child and the parent doing the harder, quieter work of co-regulation.

I want to tell you about a week I hear about often, in different forms, from different families.

Ten-year-old Theo splits his time evenly between his parents; four nights with one, three with the other, alternating. On paper, it’s about as balanced as a custody arrangement gets. Both parents love him. Both parents, back when they were still married, spent years figuring out together that Theo does best with fewer direct demands, more choices, and room to come to things in his own time. They didn’t start out understanding PDA. They got there the hard way, by watching what world and what set off hours of meltdown, and eventually they were mostly on the same page.

Then they separated. And about a year later, Theo’s dad met someone new.

She’s kind, and she genuinely wants to help. She also grew up in a home with clear rules and consequences, and every so often she gently suggests that Theo might do better with a bit more structure; a chore chart, a consistent bedtime enforced without exception, natural consequences when he pushes back. None of it is said unkindly. It’s the kind of advice most people would consider completely reasonable. Theo’s dad, tired and wanting to be a good partner and not entirely sure of himself anymore, starts tightening things up.

Within a few months, Theo is unusually quiet and compliant at his dad’s. And at his mom’s, he’s having the kind of meltdowns they hadn’t seen in over a year.

His mom isn’t causing this. She’s the one absorbing it.

What’s Actually Happening in Theo’s Nervous System

PDA is an autistic profile, though many neuroaffirming clinicians (myself included) now find Pervasive Drive for Autonomy a more accurate way to describe it. It isn’t a behavioural choice, a phase, or a parenting outcome. It’s a nervous system that experiences everyday demands, even small, gently delivered ones, as a genuine threat to autonomy, and responds the way any nervous system responds to threat: fight, flight, or freeze.

That response isn’t something a child can reason their way out of in the moment, and it isn’t something that responds well to firmer boundaries or consistent consequences; those approaches tend to escalate anxiety rather than resolve it (Nawaz & Speer, 2025). What actually helps is a low-demand, collaborative approach: fewer direct commands, more genuine choice, and a relationship built on the child feeling like a partner rather than a behaviour to be managed. (If you want the fuller picture of what’s happening physiologically, I’ve written about it in more depth in It’s Not Defiance. It’s Survival.)

Divorce, structurally, is an enormous stack of demands landing all at once, and often for months or years: new schedules, new physical spaces, court dates, packed bags, transitions between two households that don’t always agree on how things should run. For a child whose nervous system already works overtime to manage uncertainty, that’s a heavy, sustained load, even when both parents are doing their genuine best.

When Parents Agreed; Until Outside Voices Got Involved

Here’s the pattern I want to name directly, because I don’t think it gets talked about enough: a lot of the couples I work with weren’t fighting about parenting philosophy while they were married. They arrived at a neuroaffirming, low-demand approach together, often exhausted and half by accident, because it was the only thing that worked.

It’s after the separation that things shift. Divorce is disorienting, and it tends to bring a person’s confidence in their own parenting judgment down at the exact moment new voices start weighing in; a new partner who didn’t live through the years of trial and error, a grandparent who’s been quietly uneasy about the “permissive” approach all along, a well-meaning friend repeating standard parenting advice that was never built for this child. None of these people are trying to cause harm. Most of them think they’re helping. But stress and self-doubt make people more susceptible to outside opinions, and it’s genuinely common for parents to drift back toward more traditional, structure-and-consequence parenting after a divorce, particularly under the strain of managing a household alone.

For a PDA child, that drift, even a modest one, can be the difference between a home that keeps the nervous system regulated and one that requires constant masking to get through. And because it usually happens gradually, it’s easy for everyone involved, including the parent doing it, to  miss what’s actually going on until the fallout shows up somewhere else entirely.

Why One House Can Look “Fine” and the Other Can’t

This is where the custody dispute often starts, and it’s one of the most painful things for the parent on the receiving end of the fallout.

In the higher-demand household, a PDA child often masks; complies, performs, holds it together, because the environment doesn’t feel safe enough to do otherwise. In the lower-demand, more attuned household, the child’s nervous system finally gets the message that it’s allowed to stand down, and the dysregulation that’s been building all week comes out, sometimes as a meltdown, sometimes as a prolonged shutdown, sometimes a behaviour that looks nothing like the composed child the other parent describes.

Even in a genuinely equal, well-intentioned 50/50 arrangement, this can happen. It’s easy to see how it becomes a custody dispute. The parent seeing the calm, compliant version of the child can honestly believe their approach is working and the other home is the problem. The parent seeing the meltdowns is often the one being told, implicitly or explicitly, that they must be doing something wrong. In reality, they’re usually the parent the child trusts enough to fall apart in front of.

What Family Courts Often Get Wrong

There isn’t yet dedicated research on PDA and family court outcomes specifically. But recent work on neurodivergence in family law  more broadly is directly relevant. A 2025 paper written specifically for family law practitioners makes the case plainly: lawyers, mediators, and judges are going to keep encountering neurodivergent clients and children whether or not their training has caught up, and for most professionals in the field right now, it hasn’t (Cottingham & Spear, 2025).

That gap matters here specifically. Without PDA literacy, low-demand parenting can easily read as inconsistency or a lack of structure, and a child’s distress in one home can be misread as evidence of poor parenting there, rather than a nervous system finally getting a chance to settle.

A few clinical distinctions are worth putting directly in front of a legal team, in language they can use:

PDA is not Oppositional Defiant Disorder. ODD centers on willful non-compliance with authority. PDA is an involuntary anxiety response to a perceived loss of autonomy, and punitive or reward-based approaches tend to increase distress rather than resolve it (Nawaz & Speer, 2025).

Low-demand parenting is an accommodation, not indulgence. Reducing direct demands, offering genuine choices, and prioritizing co-regulation over compliance are targeted strategies for keeping an overwhelmed nervous system out of fight-or-flight; not a lack of boundaries.

A “fair” schedule isn’t automatically a workable one. Equal time is a reasonable starting point, but rigid handoff times and zero flexibility around transitions can still be destabilizing for a PDA child even when the split itself is perfectly even. A parenting plan may need built-in flexibility that a standard template doesn’t account for.

Where possible, I encourage families to explore mediation or collaborative approaches over straight litigation. An adversarial process tends to reward whichever parent present the more “manageable” child in the moment, which, as we’ve seen, isn’t necessarily the parent doing the harder job.

What Actually Helps During Transitions

The specific wording matters less than the underlying shift: offering information instead of an instruction, and a window of time instead of a countdown. “We’re heading out in about twenty minutes, whenever you’re ready” tends to land very differently than “Get your shoes on, it’s time to go,” even though they’re functionally asking for the same thing.

This isn’t about eliminating structure or letting go of expectations. It’s about giving a nervous system that reads direct commands as threat enough room to arrive at the same place without a fight it didn’t choose.

Protecting Your Own Capacity

If you’re the parent absorbing the meltdowns, I want to name something directly: this is exhausting in a way that’s hard to explain to people who haven’t lived it, and the exhaustion is real, not evidence that you’re failing.

Research on adverse life experiences in autistic and ADHD adults describes exactly this kind of cumulative toll: repeated exposure to environment and systems that don’t accommodate how someone is wired takes a measurable toll on health and capacity over time (Layinka et al., 2026). And research specifically on parents of PDA children describes what you might be feeling directly: isolation, self-doubt and the particular fatigue of being told your parenting is the problem when it’s actually the thing holding your child together (Curtis & Izett, 2025).

Adjusting how you parent to meet your child’s nervous system is where it is, especially while navigating a separation and outside opinions you didn’t ask for, isn’t a failure of parenting. It’s the harder, more skilled version of it.

The Goal Was Never a Perfectly Calm Handoff

Divorce doesn’t create PDA, but it puts a spotlight on every gap in a family’s approach, and it invites outside voices in at exactly the moment a family’s hard-won, unconventional parenting is most vulnerable to second-guessing.

If you’re the parent watching your child unravel after time at the other house, or trying to explain to a lawyer why “well-behaved at Dad’s” isn’t the whole story: you’re not imagining this, and you’re not doing it wrong. You just need people around you, clinical and legal, who understand what they’re actually looking at.

If you’re navigating a separation or custody process involving a child with autism or a PDA profile, I offer consultation to help translate what’s happening clinically into documentation your legal team can use, and to help you hold a low-demand approach steady even when the people around you are pushing the other way. Feel free to email me at Stacy@StacyFinch.com or schedule a complimentary consult here.

References

Cottingham, M. & Spear, T. (2025) Embracing neurodivergence: essential considerations in family law practice. Family Court Review, 63(1). https://doi.org/10.1111/fcre.12840 

Curtis, S. & Izett, E. (2025). The experience of mothers of autistic children with a pathological demand avoidance profile: An interpretative phenomenological analysis. Discover Mental Health, 5(5). https://doi.org/10.1007/s44192-025-00127-3 

Layinka, O., Shah, P., & Livingston, L. A. (2026). Towards a better understanding of adverse life experiences in autism and attention-deficit/hyperactivity disorder. Scientific Reports. https://doi.org/10.1038/s41598-026-61918-4 

Nawaz, S. & Speer S. (2025). What are the experiences and support needs of families of autistic children with extreme (or ‘pathological’) demand avoidance (E/PDA) behaviours? Research in Autism Spectrum Disorders, 119. https://doi.org/10.1016/j.rasd.2024.102515